I would suggest buying the heaviest natural material offered in the width and length you require. In back of them on the same or on an additional rod have a slightly smaller pair of wool blankets with with slits cut into the top that will go on the rod as a backing panel. You can conceal any appropriate material behind the chosen curtains so that it is inconspicuous to everyone but you and your significant other. The heavier the materials the more bass absorption you will experience. As always your mileage may vary. It may take some tweaking. Isn’t audio FUN!🤡
Good Materials for Curtains
Has anyone made heavy curtains specifically to add absorbance to a room, and (of course) to block the reflections of glass? If so, what materials did you use. This is such a simple and common acoustical technique, yet I can find little written about what types of fabric (etc) are best. Thanks for your experienced suggestions.